Predicting permeability distribution in complex fluvial sandstone reservoirs

摘要

Fluvial sandstone layers can be very complex internally, making them particularly frustrating reservoirs to develop. What appears as a uniform sheet of high-permeability sand may turn out to be riddled with numerous and seemingly random clay-draped discontinuity surfaces that may complicate flow models and/or compartmentalize otherwise continuous reservoirs. Because sea level cycles tend to juxtapose porous fluvial sandstone over shelfal marine source rock during regression, then conveniently cover them with sealing marine shale during subsequent transgression, such sands are highly sought as offshore targets.